Datasheet TSH511CFT, TSH511CF, TSH511 Datasheet (SGS Thomson Microelectronics)

TSH511

TSH511

HiFi stereo/mono infrared receiver

Stereo sub-carrier demodulator

■ Supply voltage: 2.3V to 5.5V

■ Carriers frequency range: 0.4 to 11 MHz

■ Two FM receivers for stereo

■ Integrated audio buffers

■ Audio out puts: 20 mW into 16 ohms

■ High sensitivity: 4µV @12dB SINAD

■ Flexib ilit y : ac c e s s pin s f or each s ec ti o n

■ Receiver 2 Standby for mono operation

DESCRIPTION

The TSH511 is a 0.4 to 11 MHz dual FM receiver.
This circuit offers the functions needed for a highly
sensitive infrared HiFi STEREO receiver.
Featuring high inpu t sensitivity a nd high i nput dy­namic range, each receiver integrates a RF
front-end LNA, an intermediate amplifier with 2 ex­ternal filters, a voltage limiter, a quadrature FM de­modulator, and finally an audio buffer.
The integrated audio buffers are abl e to drive di­rectly a 16 ohms headphone with 20mW.
A SQUELCH circuit mutes both audio amplifiers.
Access pins to each section makes the TSH511
suited for a wide field of applications.
For MONO applications, the STANDBY pin en­ables one receiver only, reducing the supp ly cur­rent.
The TSH511 forms a chipset with the du al trans­mitter TSH512.

APPLICATIONS

■ Infrared HiFi stereo receiver

■ Infrared Multimedia Headsets

■ Stereo sub-carrier demodulator

■ FM IF receiver systems

■ Power Line Carrier Intercoms

ORDER CODE

Part Number

TSH511CF -40°C to

TSH511CFT -40°C to

Temperature

Range

+85°C

+85°C

Package Conditionning Marking

TQFP44 Tray TSH511C

TQFP44 Tape & reel TSH511C

PACKAGE

F

TQFP44

10 x 10 mm

PIN CONNECTION (top view)

424344

424344

1

1

2

2

3

3

4

4

5

5

LNA

LNA

6

6

7

7

8

8

9

9

amp.

amp.

10

10

11

11

12 13 14 15 16 17 18 19 20 21 22

12 13 14 15 16 17 18 19 20 21 22

limiteramp.

limiteramp.

limiter

limiter

FM demodulator

FM demodulator

RX2

RX2

TSH511

TSH511

RX1

RX1

FM demodulator

FM demodulator

36

36

Vref

Vref

Standby

Standby

SQUELCH

SQUELCH

3435

3435

33

33

32

32

31

31

30

30

29

29

28

28

27

27

26

26

25

25

24

24

23

23

3738394041

3738394041

Audio

Audio
buffers

buffers

December 2002

1/18

TSH511

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

Vcc

Supply voltage

Toper Operating free air temperature range -40 to +85 °C

Tstg Storage temperature -65 to +150 °C

Tj Maximum junction temperature 150 °C

Rthjc Thermal resistance juncti on to case 14 °C/W

ESD

except

for pin 6

HBM: Human Body Model
CDM: Charged Device Model
MM: Machine Model

HBM: Human Body Model

ESD

only

for pin 6

CDM: Charged Device Model
MM: Machine Model

Latch-up

1. All voltages values, except differential vol tage, are wit h respect to network gr ound terminal

2. ElectroS tatic Disch arge pulse (E SD pulse) sim ul ating a human body discharge of 10 0 pF through 1.5k

3. Discharge to Ground of a device that has been previously charged.

4. ElectroS tatic Disch arge pulse (E SD pulse) approximati ng a pulse of a ma chine or mec hanical equi pment.

5. Corporate ST Microelectr oni cs proced ure number 0018695

Class

5)

1)

2)

3)

4)

7V

2

1.5

0.2
1

1

0.1
A

Ω

kV

kV

OPERATING CONDITIONS

Symbol Parameter Value Unit

Vcc Supply voltage 2.3 to 5.5 V

f

audio

f

carrier

BLOC DIAGRAM

Audio frequency range 20 to 20,000 Hz
Carrier frequency range 0.4 to 11 MHz

BUF-IN2

MIX-OUT2

MIX-OUT2

Standby

Standby

GND

GND

3435363738

3435363738

SQUELCH

SQUELCH

BUF-IN2

GND

GND

33

33

32

32

SBY1

SBY1

SBY2

SBY2

31

31

30

30

BUF-OUT2

BUF-OUT2

29

29

VCC

VCC

28

28

DEC-OUT

DEC-OUT

27

27

GND

GND

26

26

BUF-OUT1

BUF-OUT1

25

25

MUTE-OUT

MUTE-OUT

24

24

MUTE-INT

MUTE-INT

23

23

MUTE-IN

MUTE-IN

GND

GND

AMP-I N2

AMP-I N2

VCC

VCC

LNA-OUT2

LNA-OUT2

VCC

VCC

LNA-IN

LNA-IN

GND

GND

LNA-OUT1

LNA-OUT1

VCC

VCC

AMP-I N1

AMP-I N1

DEC-LNA

DEC-LNA

DEC-LIM2B

GND

GND

LIM-IN2

LIM-IN2

424344

424344

limiteramp.

limiteramp.

limiter

limiter

DEC-LIM2B

40

40

41

41

RX2

RX2

TSH511

TSH511

RX1

RX1

AMP-OUT2

AMP-OUT2

1

1

2

2

3

3

4

4

5

5

LNA

LNA

6

6

7

7

8

8

9

9

amp.

amp.

10

10

11

11

LIM-OUT2

LIM-OUT2

DEC-LIM2A

DEC-LIM2A

39

39

FM demodulator

FM demodulator

FM demodulator

FM demodulator

MIX-IN2

MIX-IN2

VCC

VCC

Audio

Audio
buffers

buffers

Vref

Vref

2/18

12 13 14 15 16 17 18 19 20 21 22

12 13 14 15 16 17 18 19 20 21 22

MIX-IN1

MIX-IN1

DEC-LIM1B

LIM-IN1

LIM-IN1

AMP-OUT1

GND

AMP-OUT1

GND

DEC-LIM1B

VCC

VCC

MIX-OUT1

GND

MIX-OUT1

DEC-LIM1

LIM-OUT1

DEC-LIM1

LIM-OUT1

GND

BUF-IN1

BUF-IN1

PIN DESCRIPTION

TSH511

Pin Pin name related to

1 GND - - GROUND
2 AMP-IN2 RX2 I Intermediate amplifier input
3 VCC - - SUPPLY VOLTAGE
4 LNA-OUT2 RX2 O Low Noise Amplifier output
5 VCC - - SUPPLY VOLTAGE
6 LNA-IN RX1 & RX2 I Low Noise Amplifier input
7 GND - - GROUND
8 LNA-OUT1 RX1 O Low Noise Amplifier output
9 VCC - - SUPPLY VOLTAGE
10 AMP-IN1 RX1 I Intermediate amplifier input
11 DEC-LNA RX1 & RX2 - Decoupling capacitor
12 AMP-OUT1 RX1 O Intermediate amplifier input
13 GND - - GROUND
14 LIM-IN1 RX1 I Limiter input
15 DEC-LIM1A RX1 - Decoupling capacitor
16 LIM-OUT1 RX1 O Limiter output
17 DEC-LIM1B RX1 - Decoupling capacitor
18 MIX-IN1 RX1 I Mixer input
19 VCC - - SUPPLY VOLTAGE
20 MIX-OUT1 RX1 O Mixer output (demodulated audio signal)
21 GND - - GROUND
22 BUF-IN1 RX1 I Audio buffer input
23 MUTE-IN RX1 & RX2 I Noise amplifier input (Squelch circuit)
24 MUTE-INT RX1 & RX2 - Capacitor connection of the noise rectifier
25 MUTE-OUT RX1 & RX2 O Capacitor connection (ramp generator to mute the audio)
26 BUF-OUT1 RX1 O Audio buffer output
27 GND - - GROUND
28 DEC-OUT RX1 & RX2 - Decoupling capacitor of Audio buffers
29 VCC - - SUPPLY VOLTAGE
30 BUF-OUT2 RX2 O Audio buffer output
31 SBY2 RX1 & RX2 I Standby 2
32 SBY1 RX1 & RX2 I Standby 1
33 GND - - GROUND
34 BUF-IN2 RX2 I Audio buffer input
35 GND - - GROUND
36 MIX-OUT2 RX2 O Mixer output
37 VCC - - SUPPLY VOLTAGE
38 MIX-IN2 RX2 I Mixer input
39 DEC-LIM2A RX2 - Decoupling capacitor
40 LIM-OUT2 RX2 O Limiter output
41 DEC-LIM2B RX2 - Decoupling capacitor
42 LIM-IN2 RX2 I Limiter input
43 GND - - GROUND
44 AMP-OUT2 RX2 O Intermediate amplifier output

1. pin direction: I = inp ut pin, O = output pi n, - = pi n to connect to supply or deco upl i ng capacitors or external compo nents

direction

1)

Pin description

3/18

TSH511

TYPICAL SCHEMATIC

Stereo infrared receiver

4/18

TSH511

INFRARED STEREO HEADPHONE APPLICATION

The right side of the figure shows the block-diagram of an infrared stereo receiver using the TSH511. The
sensitive LNA directly connected to the photodiode does not require an external pre-amplifier. After filter­ing, the amplified signals are limited and demodulated with quadrature demodulators. The two integrated
audio buffers directly drive the stereo headphones. The aud io power reaches 2
The built-in squelch function fades-out the audio when the incoming infrared signal is low. The standby in­puts SBY1 and SBY2 enable only one receiver for the mono applications.

x20mW in two 16Ω loads.

Right

Right

channel

channel

Line inputs

Line inputs

Left

Left

channel

channel

LNA + ALC

LNA + ALC

LNA + ALC

LNA + ALC

Power supply:

Power supply:

2.3 to 5.5V

2.3 to 5.5V

Icc < 20 mA stereo

Icc < 20 mA stereo

IR stereo HiFi transmitter

IR stereo HiFi transmitter

(Television)

(Television)

TSH512 TSH511

TSH512 TSH511

buffer2

TX2

TX2

VOX

VOX

TX1

TX1

buffer2

buffer1

buffer1

SBY

SBY

Vcc

Vcc

LED

LED

F

F

i

i

H

H

.

.

2

2

photodiode

photodiode

:

:

o

o

z

z

e

e

r

r

H

H

e

e

t

t

M

M

s

s

i

i

8

8

.

.

2

2

&

&

3

3

IR stereo HiFi receiver

IR stereo HiFi receiver

(Headphones)

(Headphones)

LNA

LNA

s

s

r

r

e

e

i

i

r

r

r

r

a

a

c

c

2.3 MHz

2.3 MHz

filter

filter

RX2

RX2

RX1

RX1

filter

filter

2.8 MHz

2.8 MHz

SQUELCH

SQUELCHSQUELCH

SBY1

SBY1

SBY2

SBY2

Vcc: 2.3 to 5.5V

Vcc: 2.3 to 5.5V

Current < 15 m A

Current < 15 m A

Audio

Audio

buffer2

buffer2

Audio

Audio

buffer1

buffer1

20 mW / 16 Ω

20 mW / 16 Ω

20 mW / 16 Ω

20 mW / 16 Ω

5/18

TSH511

MULTIMEDIA APPLICATION: HEADSET SIDE

The TSH511 recei ves the HiFi stereo sound f rom th e com pute r throu gh 2.3 and 2.8 MHz stereo infrared
carriers. The access pins to the RF amplifiers allow the use of a 1.7 M H z reject filter to c ancel the t rans­mitted signal of the microphone. The wide supply range (2.3 to 5.5 V) allows battery operation.

TSH511 & 512 supply:

TSH511 & 512 supply:

TSH511 & 512 supply:

2.3 to 5.5V, 25 mA

2.3 to 5.5V, 25 mA

2.3 to 5.5V, 25 mA

Voice transmittedto the PC

Voice transmittedto the PC

Voice transmittedto the PC

TSH512

TSH512

TSH512

LNA + ALC

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

MIC. BIAS

MIC. BIAS

MIC. BIAS

MIC. BIAS

LNA + ALC

LNA + ALC

LNA + ALC

TX2

TX2

TX2

VOX

VOX

VOX

TX1

TX1

TX1

1.7 MHz

1.7 MHz

1.7 MHz

Band-pass

Band-pass

Band-pass

filter

filter

filter

buffer2

buffer2

buffer2

buffer1

buffer1

buffer1

SBY

SBY

SBY

HiFi stereofromthe PC:

HiFi stereofromthe PC:

HiFi stereofromthe PC:

2x 20 mW /16 Ω

2x 20 mW /16 Ω

2x 20 mW /16 Ω

Vcc

Vcc

Vcc

Vcc

Vcc

Vcc

LED

LED

LED

TSH511

TSH511

TSH511

Audio

Audio

Audio

buffer2

buffer2

buffer2

Audio

Audio

Audio

buffer1

buffer1

buffer1

1.7 MHz

1.7 MHz

1.7 MHz
reject

reject

reject

filter

filter

filter

RX2

RX2

RX2

SQUELCH

SQUELCH

SQUELCH

RX1

RX1

RX1

SBY1

SBY2

SBY1

SBY2

SBY1

SBY2

filter

filter

filter

1.7 MHz

1.7 MHz

1.7 MHz
reject

reject

reject

Microphone Tx:

Microphone Tx:

Microphone Tx:

1.7 MHz

1.7 MHz

1.7 MHz
carrier

carrier

carrier

2.3 MHz

2.3 MHz

2.3 MHz

Band-pass

Band-pass

Band-pass

filter

filter

filter

filter

filter

filter

2.8 MHz

2.8 MHz

2.8 MHz

Band-pass

Band-pass

Band-pass

LNA

LNA

LNA

Stereo Rx:

Stereo Rx:

Stereo Rx:

2.3 & 2.8 MHz

2.3 & 2.8 MHz

2.3 & 2.8 MHz

photodiode

photodiode

photodiode

MULTIMEDIA APPLICATION: COMPUTER SIDE

In multimedia application, the TSH511 receives the voice of the user through the 1.7 MHz infrared carrier.
The standby pins can disable the unused receiver and audio amplifier to reduce the supply current.

TSH511 & 512 supply:

TSH511 & 512 supply:

2.3 to 5.5V, 24 mA

2.3 to 5.5V, 24 mA

Voice from the headset microphoneHiFi stereo

mono Rx:

mono Rx:

1.7 MHz

1.7 MHz

HiFi stereo Tx:

HiFi stereo Tx:

2.3 & 2.8 MHz

2.3 & 2.8 MHz

LED

LED

buffer2

buffer2

SBY

SBY

buffer1

buffer1

TX2

TX2

VOX

VOX

TX1

TX1

TSH512

TSH512

LNA + ALC

LNA + ALC

LNA + ALC

LNA + ALC

photodiode

photodiode

Voice from the headset microphoneHiFi stereo

LNA

LNA

RX2

RX2

RX1

RX1

filter

filter

1.7 MHz

1.7 MHz

Band-pass

Band-pass

TSH511

TSH511

SQUELCH

SQUELCHSQUELCH

SBY2

SBY2

SBY1

SBY1

Vcc

Vcc

Audio

Audio

buffer2

buffer2

Audio

Audio

buffer 1

buffer 1

6/18

TSH511

ELECTRICAL CHARACTERISTICS

Vcc = 2.7V, Tamb = 25°C, faudio = 1 kHz, fcarrier = 2.8 MHz, frequency deviation = +/-75 kHz (unless
otherwise specified)

Symbol Parameter Test condition Min Typ Max Unit

Overall Circuit (refering to typical application schematic, without reject filters)

I

CC_OX

Current consumption,
RX1 is on, RX2 is on.

Current consumption

I

CC_10

RX1 is on, RX2 is off
RX1 audio buffer is on
RX2 audio buffer is on

Current consumption

I

CC_11

RX1 is on, RX2 is off
RX1 audio buffer is on,
RX2 audio buffer is off

MAUS Maximum Usable Average Sensitivity

SN

V

Output audio signal to noise ratio

OUT

Input limiting voltage

i

THD Total Harmonic Distortion

Low Noise Amplifier (LNA) Section

G

LNA

BW
E

n_LNA

I

n_LNA

Z

LNA_IN

Z

LNA_OUT

P

1dB_LNA

IIP3

LNA voltage gain

-3dB LNA Bandwidth ZL = 2 k

LNA

Equivalent input noise voltage Rs = 0
Equivalent input noise current Rs = 0
Input impedance definied as
R

in paralell with C

LNA_IN

LNA_IN

Output impedance 200
1dB compression point

Input 3rd order interception point

LNA

SBY1 = ’Low’,
SBY2 = X
(X = don’t care)

SBY1 = ’High’,
SBY2 = ’Low’

SBY1 = ’High’,
SBY2 = ’High’

with audio SINAD=12 dB
audio BW=30 kHz

with audio SINAD=26 dB
audio BW=30 kHz

V

carrier

= 1 mV

RMS

, with

psophometric filter
output S/N reduced by

3dB, in BW = 30kHz
output S/N reduced by

3dB, psophometric filter
V

carrier

= 1 mV

RMS

, with

psophometric filter

ZL= 2 k

Ω,

= 10 MHz

f

carrier

Ω
Ω
Ω

R

LNA_IN

C

LNA_IN

ZL= 2 k

Ω

ZL= 2 k
ZL= 2 k
ZL= 2 k

Ω,
Ω
Ω,

f

carrier

f

carrier

=10 MHz

=10 MHz

15 18 mA

11 13 mA

9.5 11.5 mA

,

4

,

19
58 dB

80

60

0.6 %

18 22 28 dB

20 MHz

3.4 nV/√Hz

0.6 pA/√Hz
30

2

127

95
30
22

µV

µV

mV

mV

RMS

RMS

k

Ω

pF

Ω

RMS

RMS

7/18

TSH511

Symbol Parameter Test condition Min Typ Max Unit

Amplifier (AMP) Section

G

AMP

Z

AMP_IN

Z

AMP_OUT

P

1dBAMP

BW

Amplifier Voltage Gain
Input impedance defined as
R

in parallel with C

AMP_IN

Output impedance 350

1dB compression point

-3dB AMP Bandwidth ZL = 2 k

AMP

Limitor (LIM) Section

G

Z

LIM_IN

V

LIM_OUT

Voltage gain ZL=15kΩ tied to GND 50 54 60 dB

LIM

Input impedance defined as
R

in parallel with C

LIM_IN

Output Voltage ZL = 15 kΩ tied to GND 170

FM Demodulator Section

V

DEM

Z

DEM_OUT

Output voltage

Output impedance 100

Squelch Section

ATT

Z

N_IN

V

N_TH

V

N_HYS

Audio attenuation on each receiver
when audio buffers are muted.

Noise Amplifier Input impedance 2 k

Comparator threshold

Comparator hysteresis
Current sinked on pin 25 to discharge

capacitor: ramp generator con-

C

I

MUTE_SINK

MUTE

trolling the attenuation from ON to OFF
states of audio buffers.

Current sourced on pin 25 to charge
C

I

MUTE_SOU

RCE

capacitor: ramp generator con-

MUTE

trolling the attenuation from OFF to ON
states of audio buffers.

AMP_IN

LIM_IN

ZL=2 k

Ω,

R

AMP_IN

C

AMP_IN

ZL = 2 k
ZL = 2 k

=10 MHz

f

carrier

R

LIM_IN

C

LIM_IN

+-75 kHz FM deviation

typical a ppl i cation sch em atic

ZL = 4 k

RX1 and RX2 audio buff­ers muted

ZL = 16 Ω on both audio
buffers

from MUTED to
UNMUTED state,

R

= 22 k

MUTE

f

= 100 kHz

IN

= 22 k

R

MUTE

= 100 kHz

f

IN

Voltage on pin 25 = 1.7V 24 µA

Voltage on pin 25 = 1.7V 14 µA

Ω
Ω,

Ω

Ω

f

carrier

=10 MHz

Ω,

Ω,

16 20 dB

10

2

560

220

380

11 MHz

15

2

700 800 900

55 65 dB

9

1

mV

mV

mV

mV

mV

k
pF

Ω

k
pF

Ω

Ω

RMS

Ω

pp

RMS

Ω

RMS

RMS

8/18

TSH511

Symbol Parameter Test condition Min Typ Max Unit

Audio Buffers

Z

OD-IN

BW

1dB

P

OUT_OD

THD

THD

V

ISOL

Standby

Input Impedance

-1dB bandwith ZL = 16
Output power

Distortion in Line Driver mode

OD

Distortion in Power Amplifier mode

OD

Crosstalk: isolation between the two
Audio Buffers

Ω

ZL= 16

Ω

= 70mV

V

OD_IN

Vout = 0.5 V

= 10kΩ

Z

L

RMS

RMS

,

with decoupling capacitor

CDEC = 1µF/ceramic on
pin 28.

Pout = 20 mW,

ZL = 16Ω

Pout = 20 mW, ZL = 16

15 20 mW

Ω

200 k

35 kHz

0.2 0.3 %

0.35 0.8 %

51 dB

Ω

V

SBY_L

V

SBY_H

T

T

ON

OFF

Low level input voltage of Standby
inputs (Pins 31 & 32)

High level input voltage of Standby
inputs (Pins 31 & 32)

Turn-on time from Standby mode to
Active mode

Turn-off time from Active mode to
Standby mode

0.1

xV

CC

xVcc V

0.9

0.5 µs

0.5 µs

V

9/18

TSH511

OVERALL CIRCUIT
Supply current vs. Supply voltage

Squelc h Th re shold vs. R

Input Resistor

MUTE

20
18
16
14
12
10

(mA)

CC

I

8
6
4
2
0

0123456

RX1+RX2+Buffers

RX1+Buffers

VCC(V)

S/N vs. 2.8 MHz Input Level

60

50

40

30

Total S/N (dB)

20

10

0

1 10 100 1000

PSOPH

Input Level (µV)

RX1+ (RX1 Buffer)

BW = 30 kHz

VCC = 2.7 V
Deviation = +/-75 kHz

60

VCC = 2.7V

50

40

)

RMS

(mV

30

N_TH

V

20

10

FIN = 1 MHz

0

1 10 100

R

MUTE

FIN = 100 kHz

(kΩ)

Supply current vs. Temperature

20

VCC = 2.7V

18
16
14
12
10

(mA)

CC

I

8
6
4
2
0

-40-200 20406080

TX1+TX2+Buffers

TX1

T

(°C)

AMB

TX1+TX2

TX1+Buffers

PSOPH: Signal on Noise Ratio curve measured with a CCITT
standard psophometric bandp ass characteristic. It approximates
the response of human hearing .

10/18

Sensitivity vs. Supply Voltage

25

20

15

10

5

Sensitivity (µV) @ 26 dB SINAD

0

2345

F
F
Deviation = +/- 75kHz
BW = 30 kHz

VCC(V)

CARRIER

= 1 kHz

MOD

= 2.8MHz

AUDIO BUFFERS
Output THD+N vs. Output Power (RL = 16 Ω)

TSH511

Output THD+N vs. Output Power (RL = 16 Ω)

10

VCC = 2.3V

VCC = 2.7V

(%)

BUFFER

1

VCC = 5.5V

THD+N

RL = 16 Ω
F = 1 kHz

0.1
1 10 100

P

OUT-BUF

(mW)

BW = 30 kHz

Output THD+N vs. Output Power (RL = 32 Ω)

10

(%)

THD+N

BUFFER

1

0.1

RL = 32 Ω
F = 1 kHz
BW = 30 kHz

110100

VCC = 2.3V

VCC = 2.7V

P

OUT-BU F

VCC = 5.5V

(mW)

10

F = 20 kHz

(%)

BUFFER

1

THD+N

0.1

F = 1 kHz

RL = 16 Ω

F = 20 Hz

VCC = 2.7 V

110100

P

(mW)

OUT-BU F

Output THD+N vs. Output Power (RL = 32 Ω)

10

F = 20 kHz

(%)

BUFFER

1

0.1

F = 1 kHz

F = 20 Hz

RL = 32 Ω
VCC = 2.7 V

110100

P

(mW)

OUT-BU F

THD+N

Output THD+N vs. Output Power (RL = 600 Ω)

VCC = 2.3V

1

(%)

BUFFER

THD+N

0.1

VCC = 2.7V

VCC = 5.5V

RL = 600 Ω
F = 1 kHz
BW = 30 kHz

0.1 1 10

P

(mW)

OUT-BUF

Output THD+N vs. Output Power (RL = 600 Ω)

10

F = 20 kHz

(%)

BUFFER

1

0.1

F = 20 Hz

F = 1 kHz

0.1 1

P

(mW)

OUT- BUF

RL = 600 Ω
VCC = 2.7 V

11/18

THD+N

TSH511

Output THD+N vs. Output Voltage (RL = 10kΩ)

10

RL = 10 kΩ
F = 1 kHz
BW = 30 kHz

VCC = 2.3V

VCC = 2.7V

(%)

1

BUFFER

VCC = 5.5V

THD+N

0.1

0.1 1

V

OUT-BUF(Vrms

)

Output THD+N vs. Frequency (RL = 16 Ω)

10

VCC = 2.7 V
Vin = 50 mV
RL = 16 Ω

(%)

BUFFER

1

rms

Output THD+N vs. Output V oltage (RL = 10kΩ)

10

RL = 10 kΩ
VCC = 2.7 V

(%)

1

BUFFER

F = 20 Hz

F = 1 kHz

F = 20 kHz

THD+N

0.1

0.1 1

V

OUT-BUF(Vrms

)

Output THD+N vs. Frequency (RL = 32 Ω)

10

VCC = 2.7 V
Vin = 50 mV
RL = 32 Ω

(%)

BUFFER

1

rms

THD+N

0.1

20

100 1000 10000

Frequency (Hz)

Output THD+N vs. Frequency (RL = 600 Ω)

10

VCC = 2.7 V
Vin = 50 mV
RL = 600 Ω

(%)

BUFFER

1

THD+N

0.1

20

rms

100 1000 10000

Frequency (Hz)

THD+N

0.1

20

100 1000 10000

Frequency (Hz)

Output THD+N vs. Frequency (RL = 10 kΩ)

10

VCC = 2.7 V
Vin = 50 mV
RL = 10 kΩ

(%)

BUFFER

1

THD+N

0.1

20

rms

100 1000 10000

Frequency (Hz)

12/18

Output Power vs. Temperature

24
22
20

(mW)

18

OUT-BUF

16

P

14
12
10

-40-200 20406080

T

AMB

VCC = 2.7V
RL = 16 Ω
VIN = 70 mV

(°C)

TSH511

RMS

13/18

TSH511

GENERAL DESCRIPTION

The TSH511 is a 0.4 to 11 MHz dual FM analogue
receiver. The incoming signal is amplified with a
22 dB Low Noise Amplifier (LNA section). The
good noise performance of the LNA allows the
photodiode for infrared applications to be connect­ed directly to the TSH511 without any external
preamplifier. The access pins for each section and
the two standby configurations allow a high versa­tility for many applications: HiFi stereo infrared re­ceiver, mono/stereo subcarrier receiver, power
line carrier audio.

Figure 1 : TSH511 block diagram

MIX-IN2

LIM-OUT2

LIM-OUT2

DEC-L IM2 A

DEC-L IM2 A

FM demodulator

FM demodulator

RX2

RX2

TSH511

TSH511

RX1

RX1

FM demodulator

FM demodulator

DEC-LIM1B

DEC-LIM1B

LIM-OUT1

LIM-OUT1

MIX-IN2

MIX-IN1

MIX-IN1

GND

GND

AMP-IN2

AMP-IN2

VCC

VCC

LNA-OUT2

LNA-OUT2

VCC

VCC

LNA-IN

LNA-IN

GND

GND

LNA-OUT1

LNA-OUT1

VCC

VCC

AMP-IN1

AMP-IN1

DEC-LNA

DEC-LNA

DEC-L IM2 B

AMP-OUT2

AMP-OUT2

1

1

2

2

3

3

4

4

5

5

LNA

LNA

6

6

7

7

8

8

9

9

amp.

amp.

10

10

11

11

12 13 14 15 16 17 18 19 20 21 22

12 13 14 15 1 6 17 1 8 19 20 21 22

AMP- OUT1

AMP- OUT1

DEC-L IM2 B

GND

LIM-IN2

GND

LIM-IN2

424344

424344

limiteramp.

limiteramp.

limiter

limiter

LIM-IN1

LIM-IN1

DEC-LIM1

DEC-LIM1

GND

GND

BUF-IN2

36

36

Audio

Audio
buffers

buffers

Vref

Vref

MIX-OUT2

MIX-OUT2

MIX-OUT1

MIX-OUT1

Standby

Standby

GND

GND

3435

3435

SQUELCH

SQUELCH

GND

GND

BUF-IN2

33

33

GND

GND

32

32

SBY1

SBY1

31

31

SBY2

SBY2

BUF-OUT2

30

BUF-OUT2

30

29

29

VCC

VCC

28

28

DEC-OUT

DEC-OUT

27

27

GND

GND

26

26

BUF-OUT1

BUF-OUT1

25

25

MUTE-OUT

MUTE-OUT

24

24

MUTE-INT

MUTE-INT

23

23

MUTE-IN

MUTE-IN

BUF-IN1

BUF-IN1

VCC

VCC

3738394041

3738394041

VCC

VCC

The LNA is common to both receivers but the out­put is split in two: one for each receiver. Each LNA
output can be connected to a first optional filter for
bandpass or reject filtering.
The filtered signal is amplified with an intermedi­ate Amplifier (AMP section) followed by a second
filter. The AMP sections have 20 dB typical gain.
Finally, the sign al is amplified an d limited in the
Limiter (LIM section). The 6 0 dB amplifier-limiter
LIM provides a constant amplitude signal to the
demodulator. It reduces A M parasitics dem odula­tion in the FM demodulator.
The FM demodulator is a classical quadrature de­tector using an external tank.
The demodulated s ignal can be amplified by the
Audio Buffer section after de-em phasis. Eac h Au­dio Buffer can drive a 16 ohms headphone with 20
mW power.
The two standby pins SBY1 & SBY2 allow the sec­ond receiver RX2 to be put into standby for mono
operation. In mono, it is possible to use both Audio

Buffers or only one depending on the combination
on SBY1 & SBY2.

To avoid noise at the audio output, a Squelch sec­tion mutes the Audio Buffers when no carrier is re­ceived. The Squelch Section uses the demodulat­ed signal of the first receiver (RX1). This signal is
highpass filtered, rectified and compared to a
threshold to produce the Mute signal (pin 25).
When no carrier is received on RX1, the wideband

’FM noise’ on the demodulator increases and t he
Mute signal mutes the both Audio Buffers. Wh en
the carrier is present, the wideband noise on the
demodulator output decreases, enabling the Au­dio Buffers.

Figure 2 : Infrared audio frequencies

IR frequency applications

1.6 MHz AM mono

1.7 MHz FM mono

2.3 MHz FM right channel

2.8 MHz FM left channel or mono

LNA section: Low Noise Amplifier

The Low Noise Amplifier (LNA) has a typical gain
of 22 dB to amplify the incomi ng RF signal from
the photodiode. The LNA is common to both re­ceivers sections RX1 and RX2.

Figure 3 : LNA schematic

14/18

TSH511

The LNA output is directly connected to
LNA-OUT1 and LNA-OUT 2 pins in parallel (pin 8
and 4 respectively). As the LNA minimum imped­ance load is 1 k
LNA-OUT1 or LNA-OUT2 must be 2 k

The series 50

Ω, the load impedance on each pin

Ω minimum.

Ω resistor and the 100 nF capacitor

decouple the LNA supply voltage (pin 5), improv­ing noise performance.

AMP and LIM sections: Amplifier and Limitor

The first filter output is connected to the intermedi­ate amplifier AMP. The gain of AMP is typically 20
dB. The second filter is connected between the
output of AMP and the input of the limitor LIM. The
60 dB limitor LIM provides a constant amplitude
signal to the FM demodulator. It reduces the AM
parasitic effects into the FM demodulator.

Figure 4 : AMP and LIM schematic

allows to adjustment of the demodula tion charac­teristic. For a given transmitting deviation, a lower
value of Rlo gives a lower demodulated amplitude
and reduces the distortion.

The AC amplitude on pin 18 must not exceed 300
mV

to prevent clipping by the internal ESD di-

RMS

odes of the circuit.
The low output impedance of the demodulator

(MIX-OUT pins) drives the external volume control
and the de-emphasis filter.

Figure 5 : FM demodulator schematic

FM demodulator section

The FM demodulator is a classical quadrature de­modulator based on a multiplier. The quadrature is
performed with the tank circuit Llo inductor and
Clo capacitor. The tank circuit is tuned on the re­ceiving frequency.
The Rlo resist or is connected in p arallel with Llo
and Clo to reduce the Q factor of the tank circuit. It

SQUELCH section

To avoid audio ’FM noise’ at the speakers when
no carrier is received, the TSH511 has a built-in
Squelch circuit. The Squelch detects the wide­band ’FM noi se’ on the demodulated output a nd
fades-out the audio of both audio buffers.

The audio is filtered f rom the ’FM noise’ using t he
high-pass RC filter. The cut-off frequency is t ypi­cally 100kHz. T he squelch level depends on t he
value of the R

resistor in serie with the input

MUTE

pin of the noise amplifier MUTE-IN (pin 23). The
detected noise is integrated with the Cpeak ca­pacitor connected to MUTE-INT pin. The DC volt­age on this pin follows the amplitude of the noise.

15/18

TSH511

The comparator a nd the C

capacitor gener-

MUTE

ate the fade-in and fade-out control ramps for the
audio buffers. The Squelch has been designed
with particular attention to avoid audio pop-noise.

Figure 6 : Squelch schematic

The Audio Buffers can also drive the other usual
impedances used in audio: 32

Ω, 600Ω and 10kΩ

(see the corresponding distorsion curves).
The high input imped ances of the Audio Buffers

reduce the coupling capacitors to less than 0.1 µF
allowing space and cost saving.

Standby section

Depending on the states of the logic inputs SBY1
and SBY2, RX2 and the Audio Buffer2 can be
disabled separately. The TSH511 receiver can
adapt to different applications by using SBY1 &
SBY2 standby pins:

SBY1
pin 32

SBY2
pin 31

RX1 &
audio

buffer1

RX2

audio
buffer 2

typical
use

Low Low
Low High

ON ON ON

High Low ON OFF ON

High High ON OFF OFF

stereo

mono on
the tw o
outputs

mono on
one out­put

The squelch section is driven by the receiver RX1
but controls both audio buffers.

Audio Buf fe r sections

The audio signal from a F M demodulator enters
into the 6dB/octave low-pass filter for de-empha-

sis. 50µs and 75µs are standard de-emphasis val­ues.

After the de-emphasis network, the potentiomet er
controls the volume.

The Rail-to-Rail output stage of each Audio Buffer
is able to drive 20 mW into 16

Ω at 2.3V supply

voltage. In this condition, the distortion is typically

0.3% before saturation.

In the standard stereo mode, the configuration is:
SBY1 = SBY2 = ’Low’

In mono mode with one load(example: a single
loadspeaker), RX2 and Audio Buffer 2 are
disabled, the configuration is SBY1 = SBY2 =
’High’.

In mono mode with a stereo load (example: a
stereo headphone), the configuration is SBY1 =
’high’, SBY2 = ’Low’.

A pin connected to Vcc is at ’High’ state, and if
connected to GND is at ’Low’ state.

16/18

TSH511

APPLICA TI ON SCHEMATIC

The infrared carriers are de tected by the photodiod e and the s ignal is directly am plified by the TSH511.
Optional reject filters can be added in each channel to improve crosstalk performances. Each receiver has
a standard bandpass filter (filters F1 & F3) to select the 2.3 and 2.8 MHz carriers. After the FM
demodulators, the potentiometers P1 and P2 control the volume levels. The stereo headphones are
directly connected to the integrated audio buffers. The potentiometer P3 allows adjustment of the
sensitivity of the Sque lch. The Squelch function fade-in an d fade-out the au dio signal depending on the
level of the 2.8 MHz carrier.

17/18

TSH511

PACKAGE MECHANICAL DATA
44 PINS - PLASTIC PACKAGE

44 34

1

A

A2

e

0,10 mm
.004 inch

33

E3

SEATING PLANE

E

E1

A1

B

11

12 22

D3
D1

D

23

L1

c

L

K

0,25 mm
.010 inch
GAGE PLANE

Dimensions Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 1.60 0.063
A1 0.05 0.15 0.002 0.006
A2 1.35 1.40 1.45 0.053 0.055 0.057

B 0.30 0.37 0.40 0.012 0.015 0.016

C 0.09 0.20 0.004 0.008

D 12.00 0.472
D1 10.00 0.394
D3 8.00 0.315

e 0.80 0.031

E 12.00 0.472
E1 10.00 0.394
E3 8.00 0.315

L 0.45 0.60 0.75 0.018 0.024 0.030

L1 1.00 0.039

K 0° (min.), 7° (max.)

Information furnished is bel ieved to be accurate and reliable. However, STMicroe lectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No li cense is granted by i mp lica tion or otherwise under a n y patent or patent rig hts of STMicroelectronics. Spec ific at ions
mentioned in this publication ar e subject to change without notice. This publication supersedes and replaces all information
previously supplied. S TMicroelectronics products are not authorized for use as critica l components in life suppo rt devices or
systems without express written approval of STMicroelectronics.

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18/18